The term "new affected unit" means any affected unit, the construction or reconstruction of which is commenced after the date of enactment of the Clear Skies Act of 2002, except that for the purpose of any revision of a standard pursuant to subsection (e), "new affected unit" means any affected unit, the construction or reconstruction of which is commenced after the publication of regulations (or, if earlier, proposed regulations) prescribing a standard under this section that will apply to such unit.

III1-C is a recombinant fibronectin fragment that encompasses most of the first type III repeat, but is missing the A and B β-strands of the repeat [ 2 ] . We had previously found that III1-C inhibited the growth of normal diploid smooth muscle cells (SMCs) in culture [ 4 ] . During these experiments we noticed that the presence of III1-C in the culture medium affected the morphology of cells at early times after plating.